A Sleep Post

Historically, people slept 8-10 hours due to the day-night cycles and not having lights. That is what we are built for.
Today, people hardly sleep 8 hours in general, and then try to catch up on weekends. Then, try to cheat yourself into believing it's ok.

Either people figure out a way to not need to sleep, or sleep more per night. The simplest solution is just to sleep when one feels tired, end of story. Follow your instincts first, because science does not always give you the answers you need, when you need it.